Как получить информацию о дорожке аудио-CD?

Code:

unit frmMain;

interface

uses

Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,

Dialogs, StdCtrls, MMSystem;

type

TForm1 = class(TForm)

   Memo1: TMemo;

   Button2: TButton;

   Button3: TButton;

   procedure Button2Click(Sender: TObject);

   procedure Button3Click(Sender: TObject);

private

   function IsAudioCD(Drive: char): bool;

public

end;

var

Form1: TForm1;

implementation

{$R *.DFM}

function TForm1.IsAudioCD(Drive: char): bool;

var

DrivePath: string;

MaximumComponentLength: DWORD;

FileSystemFlags: DWORD;

VolumeName: string;

begin

Result := false;

DrivePath := Drive + ':\';

if GetDriveType(PChar(DrivePath)) = DRIVE_CDROM then

begin

   SetLength(VolumeName, 64);

   GetVolumeInformation(PChar(DrivePath), PChar(VolumeName), Length(VolumeName), nil,

     MaximumComponentLength, FileSystemFlags, nil, 0);

   if lStrCmp(PChar(VolumeName), 'Audio CD') = 0 then

     Result := True;

end;

end;

procedure TForm1.Button2Click(Sender: TObject);

begin

if IsAudioCD(' D ') then

   showmessage('Cd is an audio cd')

else

   showmessage('Cd is not an audio cd');

end;

procedure TForm1.Button3Click(Sender: TObject);

type

TDWord = record

   High: Word;

   Low: Word;

end;

var

msp: TMCI_INFO_PARMS;

MediaString: array[0..255] of char;

ret: longint;

I: integer;

StatusParms: TMCI_STATUS_PARMS;

MciSetParms: TMCI_SET_PARMS;

MciOpenParms: TMCI_OPEN_PARMS;

aDeviceID: MCIDEVICEID;

function GetTheDeviceID: MCIDEVICEID;

begin

   FillChar(MciOpenParms, SizeOf(MciOpenParms), #0);

   try

     MciOpenParms.lpstrDeviceType := 'cdaudio';

     ret := mciSendCommand(0, MCI_OPEN, MCI_OPEN_TYPE + MCI_OPEN_SHAREABLE,

       LongInt(@MciOpenParms));

     Result := MciOpenParms.wDeviceID;

   except

     on E: Exception do

     begin

       Result := 0;

       showmessage('error receiving deviceIDt' + #13 + SysErrorMessage(GetLastError)

         + #13 + E.Message);

     end;

   end;

end;

function GetTrackInfo(const uMsg: UInt; const fdwCommand: DWord;

   const dwItem: DWord; const dwTrack: DWord): string;

begin

   Result := 'Did not work...';

   FillChar(MediaString, SizeOf(MediaString), #0);

   FillChar(StatusParms, SizeOf(StatusParms), #0);

   StatusParms.dwItem := dwItem;

   StatusParms.dwTrack := dwTrack;

   ret := mciSendCommand(aDeviceID, uMsg, fdwCommand, longint(@StatusParms));

   if Ret = 0 then

     Result := IntToStr(StatusParms.dwReturn);

end;

procedure SetTimeInfo;

begin

   FillChar(MciSetParms, SizeOf(MciSetParms), #0);

   MciSetParms.dwTimeFormat := MCI_FORMAT_MSF;

   ret := mciSendCommand(aDeviceID {Mp.DeviceId}, MCI_SET, MCI_SET_TIME_FORMAT,

     longint(@MciSetParms));

   if Ret <> 0 then

     Showmessage('Error convering timeformat...');

end;

begin

Memo1.Clear;

aDeviceID := GetTheDeviceID;

Application.ProcessMessages;

Memo1.Lines.Add('Track info  :');

SetTimeInfo;

Memo1.Lines.Add('Tracks: ' + GetTrackInfo(MCI_STATUS, MCI_STATUS_ITEM,

   MCI_STATUS_NUMBER_OF_TRACKS, 0));

Memo1.Lines.Add(' ');

for I := 1 to StrToInt(GetTrackInfo(MCI_STATUS, MCI_STATUS_ITEM,

   MCI_STATUS_NUMBER_OF_TRACKS, 0)) do

begin

   Memo1.Lines.Add('Track ' + IntToStr(I) + '  :  ' + IntToStr(MCI_MSF_MINUTE

     (StrToInt(GetTrackInfo(MCI_STATUS, MCI_STATUS_ITEM +

     MCI_TRACK, MCI_STATUS_LENGTH, I)))) + ':' +

     IntToStr(MCI_MSF_SECOND(StrToInt(GetTrackInfo(MCI_STATUS,

     MCI_STATUS_ITEM + MCI_TRACK, MCI_STATUS_LENGTH, I)))));

end;

Application.ProcessMessages;

end;

end.